source: trunk/samba/source/lib/replace/libreplace_macros.m4 @ 30

Last change on this file since 30 was 30, checked in by Paul Smedley, 14 years ago

Code updated to Samba 3.0.25rc2 level

File size: 9.7 KB
Line 
1#
2# This is a collection of useful autoconf macros
3#
4
5############################################
6# Check if the compiler handles c99 struct initialization, and if not try -AC99 and -c99 flags
7# Usage: LIBREPLACE_C99_STRUCT_INIT(success-action,failure-action)
8# changes CFLAGS to add -AC99 or -c99 if needed
9AC_DEFUN([LIBREPLACE_C99_STRUCT_INIT],
10[
11saved_CFLAGS="$CFLAGS";
12c99_init=no
13if test x"$c99_init" = x"no"; then
14    AC_MSG_CHECKING(for C99 designated initializers)
15    CFLAGS="$saved_CFLAGS";
16    AC_TRY_COMPILE([#include <stdio.h>],
17     [ struct foo {int x;char y;};
18       struct foo bar = { .y = 'X', .x = 1 };   
19     ],
20     [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
21fi
22if test x"$c99_init" = x"no"; then
23    AC_MSG_CHECKING(for C99 designated initializers with -AC99)
24    CFLAGS="$saved_CFLAGS -AC99";
25    AC_TRY_COMPILE([#include <stdio.h>],
26     [ struct foo {int x;char y;};
27       struct foo bar = { .y = 'X', .x = 1 };   
28     ],
29     [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
30fi
31if test x"$c99_init" = x"no"; then
32    AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=extc99)
33    CFLAGS="$saved_CFLAGS -qlanglvl=extc99";
34    AC_TRY_COMPILE([#include <stdio.h>],
35     [ struct foo {int x;char y;};
36       struct foo bar = { .y = 'X', .x = 1 };   
37     ],
38     [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
39fi
40if test x"$c99_init" = x"no"; then
41    AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=stdc99)
42    CFLAGS="$saved_CFLAGS -qlanglvl=stdc99";
43    AC_TRY_COMPILE([#include <stdio.h>],
44     [ struct foo {int x;char y;};
45       struct foo bar = { .y = 'X', .x = 1 };   
46     ],
47     [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
48fi
49if test x"$c99_init" = x"no"; then
50    AC_MSG_CHECKING(for C99 designated initializers with -c99)
51    CFLAGS="$saved_CFLAGS -c99"
52    AC_TRY_COMPILE([#include <stdio.h>],
53     [ struct foo {int x;char y;};
54       struct foo bar = { .y = 'X', .x = 1 };   
55     ],
56     [AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
57fi
58
59if test "`uname`" = "HP-UX"; then
60  if test "$ac_cv_c_compiler_gnu" = no; then
61        # special override for broken HP-UX compiler - I can't find a way to test
62        # this properly (its a compiler bug)
63        CFLAGS="$CFLAGS -AC99";
64        c99_init=yes;
65  fi
66fi
67
68if test x"$c99_init" = x"yes"; then
69    saved_CFLAGS=""
70    $1
71else
72    CFLAGS="$saved_CFLAGS"
73    saved_CFLAGS=""
74    $2
75fi
76])
77
78dnl AC_PROG_CC_FLAG(flag)
79AC_DEFUN(AC_PROG_CC_FLAG,
80[AC_CACHE_CHECK(whether ${CC-cc} accepts -$1, ac_cv_prog_cc_$1,
81[echo 'void f(){}' > conftest.c
82if test -z "`${CC-cc} -$1 -c conftest.c 2>&1`"; then
83  ac_cv_prog_cc_$1=yes
84else
85  ac_cv_prog_cc_$1=no
86fi
87rm -f conftest*
88])])
89
90AC_DEFUN([AC_EXTENSION_FLAG],
91[
92  cat >>confdefs.h <<\EOF
93#ifndef $1
94# define $1 1
95#endif
96EOF
97AH_VERBATIM([$1], [#ifndef $1
98# define $1 1
99#endif])
100])
101
102
103dnl see if a declaration exists for a function or variable
104dnl defines HAVE_function_DECL if it exists
105dnl AC_HAVE_DECL(var, includes)
106AC_DEFUN(AC_HAVE_DECL,
107[
108 AC_CACHE_CHECK([for $1 declaration],ac_cv_have_$1_decl,[
109    AC_TRY_COMPILE([$2],[int i = (int)$1],
110        ac_cv_have_$1_decl=yes,ac_cv_have_$1_decl=no)])
111 if test x"$ac_cv_have_$1_decl" = x"yes"; then
112    AC_DEFINE([HAVE_]translit([$1], [a-z], [A-Z])[_DECL],1,[Whether $1() is available])
113 fi
114])
115
116
117# AC_CHECK_LIB_EXT(LIBRARY, [EXT_LIBS], [FUNCTION],
118#              [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
119#              [ADD-ACTION-IF-FOUND],[OTHER-LIBRARIES])
120# ------------------------------------------------------
121#
122# Use a cache variable name containing both the library and function name,
123# because the test really is for library $1 defining function $3, not
124# just for library $1.  Separate tests with the same $1 and different $3s
125# may have different results.
126#
127# Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$3])
128# is asking for trouble, since AC_CHECK_LIB($lib, fun) would give
129# ac_cv_lib_$lib_fun, which is definitely not what was meant.  Hence
130# the AS_LITERAL_IF indirection.
131#
132# FIXME: This macro is extremely suspicious.  It DEFINEs unconditionally,
133# whatever the FUNCTION, in addition to not being a *S macro.  Note
134# that the cache does depend upon the function we are looking for.
135#
136# It is on purpose we used `ac_check_lib_ext_save_LIBS' and not just
137# `ac_save_LIBS': there are many macros which don't want to see `LIBS'
138# changed but still want to use AC_CHECK_LIB_EXT, so they save `LIBS'.
139# And ``ac_save_LIBS' is too tempting a name, so let's leave them some
140# freedom.
141AC_DEFUN([AC_CHECK_LIB_EXT],
142[
143AH_CHECK_LIB_EXT([$1])
144ac_check_lib_ext_save_LIBS=$LIBS
145LIBS="-l$1 $$2 $7 $LIBS"
146AS_LITERAL_IF([$1],
147      [AS_VAR_PUSHDEF([ac_Lib_ext], [ac_cv_lib_ext_$1])],
148      [AS_VAR_PUSHDEF([ac_Lib_ext], [ac_cv_lib_ext_$1''])])dnl
149
150m4_ifval([$3],
151 [
152    AH_CHECK_FUNC_EXT([$3])
153    AS_LITERAL_IF([$1],
154              [AS_VAR_PUSHDEF([ac_Lib_func], [ac_cv_lib_ext_$1_$3])],
155              [AS_VAR_PUSHDEF([ac_Lib_func], [ac_cv_lib_ext_$1''_$3])])dnl
156    AC_CACHE_CHECK([for $3 in -l$1], ac_Lib_func,
157        [AC_TRY_LINK_FUNC($3,
158                 [AS_VAR_SET(ac_Lib_func, yes);
159                  AS_VAR_SET(ac_Lib_ext, yes)],
160                 [AS_VAR_SET(ac_Lib_func, no);
161                  AS_VAR_SET(ac_Lib_ext, no)])
162        ])
163    AS_IF([test AS_VAR_GET(ac_Lib_func) = yes],
164        [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$3))])dnl
165    AS_VAR_POPDEF([ac_Lib_func])dnl
166 ],[
167    AC_CACHE_CHECK([for -l$1], ac_Lib_ext,
168        [AC_TRY_LINK_FUNC([main],
169                 [AS_VAR_SET(ac_Lib_ext, yes)],
170                 [AS_VAR_SET(ac_Lib_ext, no)])
171        ])
172 ])
173LIBS=$ac_check_lib_ext_save_LIBS
174
175AS_IF([test AS_VAR_GET(ac_Lib_ext) = yes],
176    [m4_default([$4],
177        [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
178                case "$$2" in
179                    *-l$1*)
180                        ;;
181                    *)
182                        $2="-l$1 $$2"
183                        ;;
184                esac])
185                [$6]
186            ],
187            [$5])dnl
188AS_VAR_POPDEF([ac_Lib_ext])dnl
189])# AC_CHECK_LIB_EXT
190
191# AH_CHECK_LIB_EXT(LIBNAME)
192# ---------------------
193m4_define([AH_CHECK_LIB_EXT],
194[AH_TEMPLATE(AS_TR_CPP(HAVE_LIB$1),
195             [Define to 1 if you have the `]$1[' library (-l]$1[).])])
196
197dnl AC_SEARCH_LIBS_EXT(FUNCTION, SEARCH-LIBS, EXT_LIBS,
198dnl                    [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
199dnl                    [OTHER-LIBRARIES])
200dnl --------------------------------------------------------
201dnl Search for a library defining FUNC, if it's not already available.
202AC_DEFUN([AC_SEARCH_LIBS_EXT],
203[AC_CACHE_CHECK([for library containing $1], [ac_cv_search_ext_$1],
204[
205ac_func_search_ext_save_LIBS=$LIBS
206ac_cv_search_ext_$1=no
207AC_LINK_IFELSE([AC_LANG_CALL([], [$1])],
208               [ac_cv_search_ext_$1="none required"])
209if test "$ac_cv_search_ext_$1" = no; then
210  for ac_lib in $2; do
211    LIBS="-l$ac_lib $$3 $6 $ac_func_search_save_ext_LIBS"
212    AC_LINK_IFELSE([AC_LANG_CALL([], [$1])],
213                   [ac_cv_search_ext_$1="-l$ac_lib"
214break])
215  done
216fi
217LIBS=$ac_func_search_ext_save_LIBS])
218AS_IF([test "$ac_cv_search_ext_$1" != no],
219  [test "$ac_cv_search_ext_$1" = "none required" || $3="$ac_cv_search_ext_$1 $$3"
220  $4],
221      [$5])dnl
222])
223
224dnl check for a function in a $LIBS and $OTHER_LIBS libraries variable.
225dnl AC_CHECK_FUNC_EXT(func,OTHER_LIBS,IF-TRUE,IF-FALSE)
226AC_DEFUN([AC_CHECK_FUNC_EXT],
227[
228    AH_CHECK_FUNC_EXT($1)       
229    ac_check_func_ext_save_LIBS=$LIBS
230    LIBS="$2 $LIBS"
231    AS_VAR_PUSHDEF([ac_var], [ac_cv_func_ext_$1])dnl
232    AC_CACHE_CHECK([for $1], ac_var,
233        [AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY([$1])],
234                [AS_VAR_SET(ac_var, yes)],
235                [AS_VAR_SET(ac_var, no)])])
236    LIBS=$ac_check_func_ext_save_LIBS
237    AS_IF([test AS_VAR_GET(ac_var) = yes],
238            [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1])) $3],
239            [$4])dnl
240AS_VAR_POPDEF([ac_var])dnl
241])# AC_CHECK_FUNC
242
243# AH_CHECK_FUNC_EXT(FUNCNAME)
244# ---------------------
245m4_define([AH_CHECK_FUNC_EXT],
246[AH_TEMPLATE(AS_TR_CPP(HAVE_$1),
247             [Define to 1 if you have the `]$1[' function.])])
248
249dnl Define an AC_DEFINE with ifndef guard.
250dnl AC_N_DEFINE(VARIABLE [, VALUE])
251define(AC_N_DEFINE,
252[cat >> confdefs.h <<\EOF
253[#ifndef] $1
254[#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
255[#endif]
256EOF
257])
258
259dnl Add an #include
260dnl AC_ADD_INCLUDE(VARIABLE)
261define(AC_ADD_INCLUDE,
262[cat >> confdefs.h <<\EOF
263[#include] $1
264EOF
265])
266
267dnl remove an #include
268dnl AC_REMOVE_INCLUDE(VARIABLE)
269define(AC_REMOVE_INCLUDE,
270[
271grep -v '[#include] $1' confdefs.h >confdefs.h.tmp
272cat confdefs.h.tmp > confdefs.h
273rm confdefs.h.tmp
274])
275
276dnl remove an #define
277dnl AC_REMOVE_DEFINE(VARIABLE)
278define(AC_REMOVE_DEFINE,
279[
280grep -v '[#define] $1 ' confdefs.h |grep -v '[#define] $1[$]'>confdefs.h.tmp
281cat confdefs.h.tmp > confdefs.h
282rm confdefs.h.tmp
283])
284
285dnl AS_HELP_STRING is not available in autoconf 2.57, and AC_HELP_STRING is deprecated
286dnl in autoconf 2.59, so define AS_HELP_STRING to be AC_HELP_STRING unless it is already
287dnl defined.
288m4_ifdef([AS_HELP_STRING], , [m4_define([AS_HELP_STRING], m4_defn([AC_HELP_STRING]))])
289
290dnl check if the prototype in the header matches the given one
291dnl AC_VERIFY_C_PROTOTYPE(prototype,functionbody,[IF-TRUE].[IF-FALSE],[extraheaders])
292AC_DEFUN(AC_VERIFY_C_PROTOTYPE,
293[AC_CACHE_CHECK([for prototype $1], AS_TR_SH([ac_cv_c_prototype_$1]),
294        AC_COMPILE_IFELSE([
295                AC_INCLUDES_DEFAULT
296                $5
297                $1
298                {
299                        $2
300                }
301        ],[
302                AS_TR_SH([ac_cv_c_prototype_$1])=yes
303        ],[
304                AS_TR_SH([ac_cv_c_prototype_$1])=no
305        ])
306)
307AS_IF([test $AS_TR_SH([ac_cv_c_prototype_$1]) = yes],[$3],[$4])
308])
309
310AC_DEFUN(LIBREPLACE_PROVIDE_HEADER,
311[AC_CHECK_HEADER([$1],
312                [ AC_CONFIG_COMMANDS(rm-$1, [rm -f $libreplacedir/$1], [libreplacedir=$libreplacedir]) ],
313                [ AC_CONFIG_COMMANDS(mk-$1, [echo "#include \"replace.h\"" > $libreplacedir/$1], [libreplacedir=$libreplacedir]) ]
314        )
315])
316
317
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